Ah yeah, from a quick google search, it seems that phone is not very powerful so when you start a scene or battle, the phone most likely can't handle it and closes the game. Unfortunately, there isn't much I can do for that
Can you please add a graphics adjustment system in battle mode? I don't usually use my phone to play, I mostly use it for work. Buying a new one will take a long time, but I understand that the game was designed for PC from the beginning, so I accept that it might not be playable on mobile phones.